9 a and b
an appropriate symbol to represent the alleles for the coat colour and punnett square demonstrating genotype and phenotype

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

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explanation:

the tricuspid valve is present between right atrium and right ventricle